I have also a freeze with Braid screensaver on a Nvidia Geforce Go 7600, the Nvidia drivers and an i686 architecture. I can see the first second of the screensaver (in thumbnail or full screen), then the system freezes. It freezes only with Beryl or Compiz and theses drivers.
Ctrl + Alt + backspace has no effect, I have to riboot with the Sys Req. I join my Xorg.0.log Sorry for my english. ** Attachment added: "Xorx.0.log" http://librarian.launchpad.net/7057648/Xorg.0.log -- Braid screensaver cause desktop to freeze up https://launchpad.net/bugs/97107 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs